WP_Query accessing parent

Hello,

I have the following code:

$insearchofaparent = new WP_Query();
$insearchofaparent->query('page_id=' . $post->post_parent);
while ($insearchofaparent->have_posts()) : $insearchofaparent->the_post();
	$blah2 = printf(the_title());
endwhile;

I am trying to get the ID of the page PARENT in the variable $blah2,
but $blah2 = $insearchofaparent->post_parent; does not seem to do the trick, but the_title() does work,
any tips would be welcome!

thanks